Ore-roasting furnace



(No Model.) 2 Sheets-Sheet 1.

A. O. JOHNSON.

ORB ROAST-ING PURNAOE.

No. 391,151. Patented Oct. 16, 1888.

' ATTORNEYS.

N. PUEns. Phnmmhe n hu Washmglom u. C.

2 Sheets-Sheet '2.

(No Mode1.)

A. G. JOHNSON.

. ORE ROAISTING FURNACE.

Patented Oct. 18; 1888.

INVBNTOR BY ATTORNEYS WITNESSES Jkg kuf N. warms. Pholu-Lilhogmphon Wafllingklll. n c

UNTTED STATES PATENT QFFICE.

ALBERT O. JOHNSON, OF \VILMINGTON, DELA\VARE.

ORE-ROASTING FURNACE.

SPECIFICATION forming part of Letters Patent No. 391,151, dated October 16, 1888.

Application filed June 17, 1887.

To all whom, it may concern:

Be it known that I, ALBERT C. JOHNSON, of \Vilmington, in the county of New Castle and State of Delaware, have invented a new and Improved Ore-Roasting Furnace, of which the following is a full, clear, and exact description.

The object of my invention is to provide a new and improved ore-roasting furnace,which is simple and durable in construction and very effective in operation, for desulphurizing copper ores, iron pyrites, goldbearing sulphurets, and other ores.

The invention consists in the construction and arrangement of various parts and details and combinations of the same, as will be fully described hereinafter, and thenpointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of my improvement. Figs. 2 and 3 are plan views of the partition plates or shelves. Fig. 4 is an enlarged plan view of the hopper. Fig. 5 is a plan view of the central part of the top plate. Fig. 6 is a plan view of the hopper-disk. Figs. 7 and S are enlarged inverted plan views of the raking-bars. Fig. 9 shows views of the teeth of the raking-bars, and Fig. 10 represents the spacing-blocks for the teeth of the raking-bars.

My improved ore-roasting furnace is provided with a cylindrical shell, A, of brick or other suitable material, in which are formed the compartments B, G, D, E, and F, placed one above the other, and of which the uppermost compartment, B, is covered by a top plate, G, and the compartments B and G are separated from each other by a partitionplate, H, provided near its periphery with the segmental slots H, as shown in Fig. 2.

The compartments 0 and D are separated by the partition-plate I, provided with a central aperture, 1, and the compartments D and E are separated by another partition-plate, H, and the following compartments, E and F, are separated bya partition-plate,1. The bottom of the compartment F is formed by a plate, J, provided near its periphery on one side with an opening, J, leading into the spout or chute J supported in the cylindrical casing A and extending downward and to the outside of the Serial No. 241,627. (No model.)

said casing. Two spouts or chutes, J placed opposite each other, may be employed, if de sired.

In the center of the cylindrical casing A,and passing through the several plates G, H, I, and J, is held the vertical shaft K, supported at its lower end by a step, K, and also held in suitable bearings formed in the center of the plates J, H, and G. On the end of the shaft K, above the top plate, G, is secured the sleeve L, supporting at its lower end the disk L, providcd with openings L placed diametrically opposite each other. The disk L revolves on top of the plate G, and is held in a hopper, N, provided above said disk L,with a cross-plate, N, having the openings N corresponding in size and shape to the openings L of the disk L, and placed diametrically opposite each other.

Directly under each opening N is held a slide, N which extends to the outside of the hopper N, and serves to increase or diminish the opening N so as to feed more or less ore to the furnace. In the top plate, G, and directly below the disk L, are formed the openings G, placed diametrically opposite each other and corresponding with the openingsin the plate N, and the revolving disk D. Said openings G are placed at right angles to the openings N in the hopper N, so that when the openings L of the revolving disk L register with the openings N of the hopper they do not register with the openings G of the top plate, G, and vice versa.

In each of the compartments B, C, D, E, and F are placed the raking-bars 0, each consisting of the slotted arms P, clamped to the shaft K by suitable means and extending in a straight line equal distances on each side of said shaft K. On the slotted arms P are held the raking fingers or teeth Q, and between each two successive fingers are placed the spacingblocks R, which may be of different widths for regulating the distances between the several teeth or fingers Q. The spacing-blocks Rand the fingers Q are held in place in the slotted arms P by a setscrew, S, screwing in an end plate, P, secured to the outer ends of the slotted arms P, said set-screw S screwing against the outermost finger held in the arms P. A tooth, Q. or spacing-block B may be easily removed from the arms P, in-case one is broken, by removing the end plate, P, whereby the several spacingblocks and fingers held between said arms can be easily removed and replaced by new ones.

Each of the fingers Q is provided on its bottom with an inclined plate, Q, extending to near the tops of the partition-plates, and arranged in such a manner in the several compartments, B, G, D, E, and F, that the rakingbars in the compartment B move the ore outward toward the openings H, while in the compartment 0 the incline Q is so arranged I as to move the ores inward toward the center into the opening I, and in the next following compartment D the inclines Q are placed to move the ore outward again to the openings H, and in the next following compartment E the teeth Q are arranged to move the ore inward again toward the center of the plate I and into the opening I, and in the lowest compartment, F, the teeth Q move the ore outward toward and into the opening J, so that the ore falls into the chute J and is delivered to the outside of the furnace.

The shaft K is provided at its lowerend with a bevel gear-wheel, T, into which meshes the pinion T,'secured to the driving-shaft T,

which, when rotated by suitable means, imparts a rotary motion to the shaft K in the direction of the arrow a. (Shown in Figs. 7 and 8.) Instead of the gear-wheels T and T, I may employ other means for revolving said shaft K. Into each compartment B, O, D, E, and F lead a number of doors for starting afire in the respective compartments and for other purposes.

The operation is as follows: The ore placed in the hopper N passes through the openings N into the openings 'L" of the disk L, which revolves with the shaft K and transmits the ore to the openings G in the top plate, G, whereby the ore falls through said openings G into the center of the compartment B, and is moved outward on the top of the partitionp'late H by the raking-bars 0 until the ore is pushed through the openings H into the compartment O, in which the raking-bars 0 move the ore inward and discharge the same through the opening 1 into the next following compartment B, and in the latter the ore is transmitted from the top of the partition-plate H outward and through the opening H into the compartment E, from which the ore is moved inward by the raking-bars 0 through the opening 1 into the lowest compartment, F, and in the latter the ore is again moved outward and discharged through the spout or spoutsJ above described.

It will be seen that the ore is regularly fed into the top compartment, B, by the revolving of the disk L, as the openings of the latter connect alternately with the openings in the hopper and with the openings G in the top plate, G. The ore is gradually moved from one compartment to the other, and is agitated in each compartment by the raking teeth or fingers, which at the same time impart an outward or inward motion to said ore.

My improved furnace does not require a supply of external heat, as, on starting, the furnace is heated to the required temperature by burning wood or other suitable fuel in the several compartments, B, O, D, E, and F, after which the temperature in the several compartments is sustained and held permanently by the combustion of material under treatment-.- that is, the sulphur or other substance contained in the ore.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

slot, and a plate closing the outer or open end of the slot, and provided with a screw entering the slot and bearing against the outer finger or tooth, substantially as set forth.

2. In an ore-roasting furnace, a rake consisting in the slotted arm P,the separate and independent T-headed teeth or fingers held in said slot and formed on their lower faces with the inclined plates Q, the T-headed spacing-blocks R. also held in said slot, and the plate 1?, closing the outer or open end of the slot, substantially as set forth, whereby any tooth may be removed and the distance between the teeth be properly spaced.

ALBERT G. JOHNSON.

Witnesses:

W. S. PUOKETT, E. H. GREGG. 

